diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -29,6 +29,7 @@
 	sudoku \
 	cunit \
 	md5 \
+	md5rec \
 	varargs \
 	concatenation \
 	alpha_beta \
@@ -175,6 +176,10 @@
 
 md5: md5.o
 	@echo Linking $< ...
+	@$(CC) -o $@ $< -lssl
+
+md5rec: md5rec.o
+	@echo Linking $< ...
 	@$(CC) -o $@ $< -llsf
 
 varargs: varargs.o